/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
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 * See @authors listed below
 *
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package org.dcm4che3.util;

import java.net.URL;

/**
 * Utility methods to locate resources on the context classloader or
 * the class loader that loaded the class passed as parameter. 
 * 
 * @author Umberto Cappellini <umberto.cappellini@agfa.com>
 *
 */
public class ResourceLocator {
    
    public static String resourceURL(String name) {
        ClassLoader tcl = Thread.currentThread().getContextClassLoader();
        URL url = tcl.getResource(name);
        return url != null ? url.toString() : null;
    }
    
    public static String getResource(String resource, Object source) {
        Class<?> c = source == null ? null : source.getClass();
        return getResource(resource, c);
    }

    public static String getResource(String resource, Class<?> c) {
        URL url = getResourceURL(resource, c);
        return url != null ? url.toString() : null;
    }

    public static URL getResourceURL(String resource, Object source) {
        Class<?> c = source == null ? null : source.getClass();
        return getResourceURL(resource, c);
    }

    public static URL getResourceURL(String resource, Class<?> c) {
        if (c != null) {
            ClassLoader classLoader = c.getClassLoader();
            if (classLoader != null) {
                return classLoader.getResource(resource);
            }
        }
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        if (classLoader != null) {
            return classLoader.getResource(resource);
        }
        return ClassLoader.getSystemResource(resource);
    }

}
